On Thu, 27 Sep 2018, zhong jiang wrote: > From: Alexey Dobriyan <[email protected]> > > /* > * cpu_partial determined the maximum number of objects > * kept in the per cpu partial lists of a processor. > */ > > Can't be negative.
True. > I hit a real issue that it will result in a large number of memory leak. > Because Freeing slabs are in interrupt context. So it can trigger this issue. > put_cpu_partial can be interrupted more than once. > due to a union struct of lru and pobjects in struct page, when other core > handles > page->lru list, for eaxmple, remove_partial in freeing slab code flow, It will > result in pobjects being a negative value(0xdead0000). Therefore, a large > number > of slabs will be added to per_cpu partial list. That sounds like it needs more investigation. Concurrent use of page fields for other purposes can cause serious bugs. > > I had posted the issue to community before. The detailed issue description is > as follows. I did not see it. Please make sure to CC the maintainers.
